package com.mislead.ikanxue.app.util;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * CrashHandler UncaughtException处理�?,当程序发生Uncaught异常的时�?,有该类来接管程序,并记录发送错误报�?.
 *
 * @author larry 2015-4-21 下午3:15:09
 * @version 1.0.0
 */
public class CrashHandler implements UncaughtExceptionHandler {

  public static final String TAG = "CrashHandler";

  // 系统默认的UncaughtException处理�?
  private UncaughtExceptionHandler mDefaultHandler;
  // CrashHandler实例
  private static CrashHandler INSTANCE = new CrashHandler();
  // 程序的Context对象
  private Context mContext;
  // 用来存储设备信息和异常信�?
  private Map<String, String> infos = new HashMap<String, String>();

  // 用于格式化日�?,作为日志文件名的�?部分
  private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

  /** 保证只有一个CrashHandler实例 */
  private CrashHandler() {
  }

  /** 获取CrashHandler实例 ,单例模式 */
  public static CrashHandler getInstance() {
    return INSTANCE;
  }

  /**
   * 初始�?
   */
  public void init(Context context) {
    mContext = context;
    // 获取系统默认的UncaughtException处理�?
    mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
    // 设置该CrashHandler为程序的默认处理�?
    Thread.setDefaultUncaughtExceptionHandler(this);
  }

  /**
   * 当UncaughtException发生时会转入该函数来处理
   */
  @Override public void uncaughtException(Thread thread, Throwable ex) {
    if (!handleException(ex) && mDefaultHandler != null) {
      // 如果用户没有处理则让系统默认的异常处理器来处�?
      mDefaultHandler.uncaughtException(thread, ex);
    } else {
      try {
        Thread.sleep(1000);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
      android.os.Process.killProcess(android.os.Process.myPid());
      System.exit(10);
    }
  }

  /**
   * 自定义错误处�?,收集错误信息 发�?�错误报告等操作均在此完�?.
   *
   * @return true:如果处理了该异常信息;否则返回false.
   */
  private boolean handleException(final Throwable ex) {
    if (ex == null) {
      return false;
    }

    // 使用Toast来显示异常信�?
    new Thread() {
      @Override public void run() {
        Looper.prepare();
        Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG).show();
        Looper.loop();
      }
    }.start();
    // 收集设备参数信息
    collectDeviceInfo(mContext);
    // 保存日志文件
    saveCrashInfo2File(ex);
    return true;
  }

  /**
   * 收集设备参数信息
   */
  public void collectDeviceInfo(Context ctx) {
    try {
      PackageManager pm = ctx.getPackageManager();
      PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
      if (pi != null) {
        String versionName = pi.versionName == null ? "null" : pi.versionName;
        String versionCode = pi.versionCode + "";
        infos.put("versionName", versionName);
        infos.put("versionCode", versionCode);
      }
    } catch (NameNotFoundException e) {
      Log.e(TAG, "an error occured when collect package info", e);
    }
    Field[] fields = Build.class.getDeclaredFields();
    for (Field field : fields) {
      try {
        field.setAccessible(true);
        infos.put(field.getName(), field.get(null).toString());
        Log.d(TAG, field.getName() + " : " + field.get(null));
      } catch (Exception e) {
        Log.e(TAG, "an error occured when collect crash info", e);
      }
    }
  }

  /**
   * 保存错误信息到文件中
   *
   * @return 返回文件名称, 便于将文件传送到服务�?
   */
  private String saveCrashInfo2File(Throwable ex) {

    StringBuffer sb = new StringBuffer();
    for (Map.Entry<String, String> entry : infos.entrySet()) {
      String key = entry.getKey();
      String value = entry.getValue();
      sb.append(key + "=" + value + "\n");
    }

    Writer writer = new StringWriter();
    PrintWriter printWriter = new PrintWriter(writer);
    ex.printStackTrace(printWriter);
    Throwable cause = ex.getCause();
    while (cause != null) {
      cause.printStackTrace(printWriter);
      cause = cause.getCause();
    }
    printWriter.close();
    String result = writer.toString();
    sb.append(result);
    try {
      long timestamp = System.currentTimeMillis();
      String time = formatter.format(new Date());
      String fileName = mContext.getPackageName() + "-" + getVersionName() + "-" + time + ".log";
      if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        String path = Environment.getExternalStorageDirectory().getAbsolutePath()
            + File.separator
            + "crash"
            + File.separator;
        File dir = new File(path);
        if (!dir.exists()) {
          dir.mkdirs();
        }
        FileOutputStream fos = new FileOutputStream(path + fileName);
        fos.write(sb.toString().getBytes());
        fos.close();
      }
      return fileName;
    } catch (Exception e) {
      Log.e(TAG, "an error occured while writing file...", e);
    }
    return null;
  }

  private String getVersionName() {
    try {
      PackageInfo info = mContext.getPackageManager()
          .getPackageInfo(mContext.getPackageName(), PackageManager.GET_CONFIGURATIONS);
      return info.versionName;
    } catch (NameNotFoundException e) {
      e.printStackTrace();
      return null;
    }
  }

  /**
   * 异常后重启应�?
   */
  private void restartApplication() {
    Intent intent =
        mContext.getPackageManager().getLaunchIntentForPackage(mContext.getPackageName());
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    mContext.startActivity(intent);
    // �?�?
    android.os.Process.killProcess(android.os.Process.myPid());
    System.exit(0);
  }
}